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whats2000

Isaac Sim MCP Server

by whats2000

get_prim_info

Inspect a USD prim to get its type, world-space position, children, and actual size for geometric prims, accounting for scale.

Instructions

Get detailed information about a specific prim.

Returns type, world-space position, and children. For geometric prims (Cube, Sphere, Cylinder, Cone, Capsule), also returns actual_size [x, y, z] in meters accounting for scale and default primitive dimensions.

Args: prim_path: The USD prim path to inspect.

Input Schema

TableJSON Schema
NameRequiredDescriptionDefault
prim_pathYes

Output Schema

TableJSON Schema
NameRequiredDescriptionDefault
resultYes
Behavior2/5

Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?

No annotations are provided. The description does not disclose behavioral traits such as whether the operation is read-only, requires permissions, or has side effects. It only lists return values without safety context.

Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.

Conciseness4/5

Is the description appropriately sized, front-loaded, and free of redundancy?

The description is concise with an args section, but the info about return fields could be more structured (e.g., bullet points). It avoids verbosity.

Shorter descriptions cost fewer tokens and are easier for agents to parse. Every sentence should earn its place.

Completeness3/5

Given the tool's complexity, does the description cover enough for an agent to succeed on first attempt?

Given the output schema exists (context signal), the description doesn't need to detail return values fully. However, it lacks error conditions, edge cases, and confirms no side effects. Adequate for a simple tool.

Complex tools with many parameters or behaviors need more documentation. Simple tools need less. This dimension scales expectations accordingly.

Parameters3/5

Does the description clarify parameter syntax, constraints, interactions, or defaults beyond what the schema provides?

The schema has 0% description coverage. The description adds meaning by stating prim_path is 'the USD prim path to inspect', but lacks format examples or constraints beyond the schema's type/required.

Input schemas describe structure but not intent. Descriptions should explain non-obvious parameter relationships and valid value ranges.

Purpose5/5

Does the description clearly state what the tool does and how it differs from similar tools?

The description clearly states the tool gets detailed info about a prim, listing return fields (type, position, children, actual_size for geometric prims). It distinguishes from sibling tools like get_robot_info or get_scene_info by specifying 'prim' focus.

Agents choose between tools based on descriptions. A clear purpose with a specific verb and resource helps agents select the right tool.

Usage Guidelines3/5

Does the description explain when to use this tool, when not to, or what alternatives exist?

The description does not provide explicit guidance on when to use this tool versus alternatives like get_joint_positions or get_scene_info. It is implied for prim inspection, but no when-not-to or alternatives mentioned.

Agents often have multiple tools that could apply. Explicit usage guidance like "use X instead of Y when Z" prevents misuse.

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